I‘m glad @Hooked_on_books ‘s review pulled this out of my library pile. Great novel about blended family dynamics.
Pia has been living with her scientist mother in Tahiti. During the pandemic, Pia heads to NYC where her cardiologist dad is scarce (busy at the hospital) forcing her to spend more time with her new (younger) stepmom than she‘d like. Bonds and trust are tested among all the family when Pia goes missing.